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Pavements 2025

Asphalt Binder and Mixture Characterization

POSTER RECEPTION (View list of posters here)

Investigating the Effect of Fillers and Filler-Binder Ratios on Bond Strength of Asphalt Mastic

Tuesday, June 10, 2025
4:45 PM – 6:00 PM MT
Abstract: The current study is pivoted on the investigation of moisture susceptibility and bond strength of asphalt mastics with the emphasis on filler type and the filler-binder (F-B) ratios. The asphalt mastics were prepared with six fillers and one viscosity graded (VG-30) binder at three F-B ratios. The bond strength between Dolomite aggregates and the asphalt mastics was determined using the bitumen bond strength (BBS) in both dry and wet conditions. The properties of the fillers influence the bond strength of the mastics, which were determined by the set of characterization tests. The results stated that the limestone based mastics exhibited the highest moisture resistance, owing to stronger bonds due to calcite content whereas the quartz based mastics demonstrated weaker bond strength. The significant effect of the filler type was also validated by the statistical analysis using analysis of variance (ANOVA) as 95% confidence interval. On the other hand, the F-B ratio showed a minimal impact, especially in wet conditions. Based on the outcomes of this study, a threshold bond strength ratio of 0.75 was established as a qualifying criterion for moisture resistance. The findings highlight the significance of choice of filler for the increased durability against moisture damage, providing the framework for filler selection to optimize the pavement resilience.

Learning Objectives:

Attendees can expect to learn the following from this session:
  • Explains how different filler types affect the bond strength and moisture resistance of asphalt mastics, focusing on their mineral composition and physical properties.
  • Analyze the impact of varying filler-binder (F-B) ratios on the mechanical and moisture damage resistance properties of asphalt, identifying optimal ratios for enhanced performance.
  • Utilize findings on filler types and F-B ratios to recommend materials and design adjustments that improve asphalt resilience against moisture-induced damage in pavement structures.